Device and Method for Reducing Quantization Noise in a Time-Domain Decoder
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Abstract
The present disclosure relates to a device and method for reducing quantization noise in a sound signal contained in a time-domain excitation decoded by a time-domain decoder. A future frame time-domain excitation is evaluated based on the decoded time-domain excitation. A concatenated time-domain excitation is produced from the decoded time-domain excitation of the time-domain excitation of the future frame and is converted into a frequency-domain excitation. A weighting mask is produced for retrieving spectral information lost in the quantization noise. The frequency-domain excitation is modified to increase spectral dynamics by application of the weighting mask. The modified frequency-domain excitation is converted into a modified time-domain excitation. The latter conversion is delay-less. In an embodiment, the weighting mask may be produced using time averaging or frequency averaging or a combination of time and frequency averaging of the frequency-domain excitation. The method and device can be used for improving music content rendering of linear-prediction (LP) based codecs.
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Citations
31 Claims
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11. (canceled)
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13. A device for reducing quantization noise in a sound signal contained in a time-domain excitation decoded by a time-domain decoder, comprising:
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at least one processor; and a memory coupled to the at least one processor and comprising non-transitory code instructions that, when executed, cause the at least one processor to implement; a converter of the decoded time-domain excitation into a frequency-domain excitation; a mask builder to produce a weighting mask for retrieving spectral information lost in the quantization noise, wherein the mask builder produces the weighting mask using time averaging or frequency averaging or a combination of time and frequency averaging of the frequency-domain excitation; a modifier of the frequency-domain excitation to increase spectral dynamics by application of the weighting mask; and a converter of the modified frequency-domain excitation into a modified time-domain excitation. - View Dependent Claims (14)
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15. A method for reducing quantization noise in a sound signal contained in a time-domain excitation decoded by a time-domain decoder, comprising:
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Evaluating, based on the decoded time-domain excitation, a time-domain excitation of a future frame; concatenating the decoded time-domain excitation and the time-domain excitation of the future frame to form a concatenated time-domain excitation; converting, by the time-domain decoder, the concatenated time-domain excitation into a frequency-domain excitation; producing a weighting mask for retrieving spectral information lost in the quantization noise; modifying the frequency-domain excitation to increase spectral dynamics by application of the weighting mask; and converting the modified frequency-domain excitation into a modified time-domain excitation; wherein conversion of the modified frequency-domain excitation into the modified time-domain excitation is delay-less. - View Dependent Claims (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 16, 17, 18, 19, 20, 22, 23)
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22-1. A method according to claim 15, comprising analyzing the frequency-domain excitation to determine whether the frequency-domain excitation contains music.
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26. A method for reducing quantization noise in a sound signal contained in a time-domain excitation decoded by a time-domain decoder, comprising:
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converting, by the time-domain decoder, the decoded time-domain excitation into a frequency-domain excitation; producing a weighting mask for retrieving spectral information lost in the quantization noise, wherein the weighting mask is produced using time averaging or frequency averaging or a combination of time and frequency averaging of the frequency-domain excitation; modifying the frequency-domain excitation to increase spectral dynamics by application of the weighting mask; and converting the modified frequency-domain excitation into a modified time-domain excitation - View Dependent Claims (27)
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28. A device for reducing quantization noise in a sound signal contained in a time-domain excitation decoded by a time-domain decoder, comprising:
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at least one processor; and a memory coupled to the at least one processor and comprising non-transitory code instructions that, when executed, cause the at least one processor to; evaluate, based on the decoded time-domain excitation, a time-domain excitation of a future frame; concatenate the decoded time-domain excitation and the time-domain excitation of the future frame to form a concatenated time-domain excitation; convert the concatenated time-domain excitation into a frequency-domain excitation; produce a weighting mask for retrieving spectral information lost in the quantization noise; modify the frequency-domain excitation to increase spectral dynamics by application of the weighting mask; and converting the modified frequency-domain excitation into a modified time-domain excitation; wherein conversion of the modified frequency-domain excitation into the modified time-domain excitation is delay-less.
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29. A device for reducing quantization noise in a sound signal contained in a time-domain excitation decoded by a time-domain decoder, comprising:
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at least one processor; and a memory coupled to the at least one processor and comprising non-transitory code instructions that, when executed, cause the at least one processor to; convert the decoded time-domain excitation into a frequency-domain excitation; produce a weighting mask for retrieving spectral information lost in the quantization noise, wherein the weighting mask is produced using time averaging or frequency averaging or a combination of time and frequency averaging of the frequency-domain excitation; modify of the frequency-domain excitation to increase spectral dynamics by application of the weighting mask; and convert the modified frequency-domain excitation into a modified time-domain excitation.
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30. A device for reducing quantization noise in a sound signal contained in a time-domain excitation decoded by a time-domain decoder, comprising:
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an excitation extrapolator to evaluate, based on the decoded time-domain excitation, a time-domain excitation of a future frame; an excitation concatenator to concatenate the decoded time-domain excitation and the extrapolated time-domain excitation of the future frame to form a concatenated time-domain excitation; a converter of the concatenated time-domain excitation into a frequency-domain excitation; a mask builder to produce a weighting mask for retrieving spectral information lost in the quantization noise; a modifier of the frequency-domain excitation to increase spectral dynamics by application of the weighting mask; and a converter of the modified frequency-domain excitation into a modified time-domain excitation; wherein conversion of the modified frequency-domain excitation into the modified time-domain excitation is delay-less.
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31. A device for reducing quantization noise in a sound signal contained in a time-domain excitation decoded by a time-domain decoder, comprising:
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a converter of the decoded time-domain excitation into a frequency-domain excitation; a mask builder to produce a weighting mask for retrieving spectral information lost in the quantization noise, wherein the mask builder produces the weighting mask using time averaging or frequency averaging or a combination of time and frequency averaging of the frequency-domain excitation; a modifier of the frequency-domain excitation to increase spectral dynamics by application of the weighting mask; and a converter of the modified frequency-domain excitation into a modified time-domain excitation.
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Specification